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Two-step sulfonation process for the conversion of polymer fibers to carbon fibers

United States Patent

9,816,207
November 14, 2017
View the Complete Patent at the US Patent & Trademark Office
Disclosed herein are processes for preparing carbon fibers, comprising: sulfonating a polymer fiber with a sulfonating agent that is fuming sulfuric acid, sulfuric acid, chlorosulfonic acid, or a combination thereof; treating the sulfonated polymer with a heated solvent, wherein the temperature of the heated solvent is at least 95.degree. C.; and carbonizing the resulting product by heating it to a temperature of 501-3000.degree. C. Carbon fibers prepared according to these methods are also disclosed herein.
Barton; Bryan E. (Midland, MI), Patton; Jasson T. (Midland, MI), Hukkanen; Eric J. (Midland, MI), Bernius; Mark T. (Bowling Green, OH)
Dow Global Technologies LLC (Midland, MI)
14/ 413,454
20150152574
July 3, 2013
STATEMENT OF GOVERNMENT INTEREST This invention was made under a NFE-10-02991 between The Dow Chemical Company and UT-Batelle, LLC, operating and management Contractor for the Oak Ridge National Laboratory operated for the United States Department of Energy. The Government has certain rights in this invention.